What is the definition of law of conservation?

Answer:

There are a number of different conservation laws in science, such as the law of conservation of momentum, the law of conservation of mass/energy, the law of conservation of charge, etc. In general a law of conservation states that there is some measurable quantity of something, which can neither be created nor destroyed. So, while you can transfer momentum from one object to another object, the total amount of momentum remains the same, always, no matter what you do.

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